Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves
Seismic coda measurements retrieve parameters linked to the physical characteristics of rock volumes illuminated by high frequency scattered waves. Space weighting functions (SWF) and kernels are different tools that model the spatial sensitivity of coda envelopes to scattering and absorption anomal...
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ftunivgranada:oai:digibug.ugr.es:10481/55548 2023-05-15T14:02:25+02:00 Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves Pezzo, Edoardo del Torre Vega, Ángel De La Bianco, Francesca Ibáñez Godoy, Jesús Miguel Gabrielli, Simona Siena, Luca De 2018-05-11 application/pdf http://hdl.handle.net/10481/55548 eng eng MDPI Del Pezzo, E. [et al.]. Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves. Geosciences 2018, 8, 175; doi:10.3390/geosciences8050175. 2076-3263 http://hdl.handle.net/10481/55548 Atribución 3.0 España http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess CC-BY Seismic attenuation Seismic coda Seismic scattering Diffusion Coda imaging info:eu-repo/semantics/article 2018 ftunivgranada https://doi.org/10.3390/geosciences8050175 2020-01-18T10:20:51Z Seismic coda measurements retrieve parameters linked to the physical characteristics of rock volumes illuminated by high frequency scattered waves. Space weighting functions (SWF) and kernels are different tools that model the spatial sensitivity of coda envelopes to scattering and absorption anomalies in these rock matrices, allowing coda-wave attenuation (Qcoda) imaging. This note clarifies the difference between SWF and sensitivity kernels developed for coda wave imaging. It extends the SWF previously developed in 2D to the third dimension by using radiative transfer and the diffusion equation, based on the assumption that variations of Qcoda depend solely on variations of the extinction length. When applied to active data (Deception Island, Antarctica), 3D SWF images strongly resemble 2D images, making this 3D extension redundant. On the other hand, diffusion does not efficiently model coda waveforms when using earthquake datasets spanning depths between 0 and 20 km, such as at Mount St. Helens volcano. In this setting, scattering attenuation and absorption suffer tradeoffs and cannot be separated by fitting a single seismogram energy envelope for SWF imaging. We propose that an approximate analytical 3D SWF, similar in shape to the common coda kernels used in literature, can still be used in a space weighted back-projection approach. While Qcoda is not a physical parameter of the propagation medium, its spatially-dependent modeling allows improved reconstruction of crustal-scale tectonic and geological features. It is even more efficient as a velocity independent imaging tool for magma and fluid storage when applied to deep volcanism. This research was partly supported by the Projects TEC2015-68752 (MINECO/FEDER), TEC2015-68752 (KNOWAVES). Article in Journal/Newspaper Antarc* Antarctica Deception Island DIGIBUG: Repositorio Institucional de la Universidad de Granada Deception Island ENVELOPE(-60.633,-60.633,-62.950,-62.950) Geosciences 8 5 175 |
institution |
Open Polar |
collection |
DIGIBUG: Repositorio Institucional de la Universidad de Granada |
op_collection_id |
ftunivgranada |
language |
English |
topic |
Seismic attenuation Seismic coda Seismic scattering Diffusion Coda imaging |
spellingShingle |
Seismic attenuation Seismic coda Seismic scattering Diffusion Coda imaging Pezzo, Edoardo del Torre Vega, Ángel De La Bianco, Francesca Ibáñez Godoy, Jesús Miguel Gabrielli, Simona Siena, Luca De Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
topic_facet |
Seismic attenuation Seismic coda Seismic scattering Diffusion Coda imaging |
description |
Seismic coda measurements retrieve parameters linked to the physical characteristics of rock volumes illuminated by high frequency scattered waves. Space weighting functions (SWF) and kernels are different tools that model the spatial sensitivity of coda envelopes to scattering and absorption anomalies in these rock matrices, allowing coda-wave attenuation (Qcoda) imaging. This note clarifies the difference between SWF and sensitivity kernels developed for coda wave imaging. It extends the SWF previously developed in 2D to the third dimension by using radiative transfer and the diffusion equation, based on the assumption that variations of Qcoda depend solely on variations of the extinction length. When applied to active data (Deception Island, Antarctica), 3D SWF images strongly resemble 2D images, making this 3D extension redundant. On the other hand, diffusion does not efficiently model coda waveforms when using earthquake datasets spanning depths between 0 and 20 km, such as at Mount St. Helens volcano. In this setting, scattering attenuation and absorption suffer tradeoffs and cannot be separated by fitting a single seismogram energy envelope for SWF imaging. We propose that an approximate analytical 3D SWF, similar in shape to the common coda kernels used in literature, can still be used in a space weighted back-projection approach. While Qcoda is not a physical parameter of the propagation medium, its spatially-dependent modeling allows improved reconstruction of crustal-scale tectonic and geological features. It is even more efficient as a velocity independent imaging tool for magma and fluid storage when applied to deep volcanism. This research was partly supported by the Projects TEC2015-68752 (MINECO/FEDER), TEC2015-68752 (KNOWAVES). |
format |
Article in Journal/Newspaper |
author |
Pezzo, Edoardo del Torre Vega, Ángel De La Bianco, Francesca Ibáñez Godoy, Jesús Miguel Gabrielli, Simona Siena, Luca De |
author_facet |
Pezzo, Edoardo del Torre Vega, Ángel De La Bianco, Francesca Ibáñez Godoy, Jesús Miguel Gabrielli, Simona Siena, Luca De |
author_sort |
Pezzo, Edoardo del |
title |
Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
title_short |
Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
title_full |
Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
title_fullStr |
Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
title_full_unstemmed |
Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
title_sort |
numerically calculated 3d space-weighting functions to image crustal volcanic structures using diffuse coda waves |
publisher |
MDPI |
publishDate |
2018 |
url |
http://hdl.handle.net/10481/55548 |
long_lat |
ENVELOPE(-60.633,-60.633,-62.950,-62.950) |
geographic |
Deception Island |
geographic_facet |
Deception Island |
genre |
Antarc* Antarctica Deception Island |
genre_facet |
Antarc* Antarctica Deception Island |
op_relation |
Del Pezzo, E. [et al.]. Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves. Geosciences 2018, 8, 175; doi:10.3390/geosciences8050175. 2076-3263 http://hdl.handle.net/10481/55548 |
op_rights |
Atribución 3.0 España http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3390/geosciences8050175 |
container_title |
Geosciences |
container_volume |
8 |
container_issue |
5 |
container_start_page |
175 |
_version_ |
1766272695206412288 |